Drop-table mechanism for milling-machines.



lA. E. NEWTON F. K. HENDRICKSON..

DROP TABLE MECHANISM FOR NHLLING MACHINES.

AEPLICATION FILED DEC.2I. 1914 i7. K. xLNDHICKSON @e4/mism FOR www MACHINES.

@med Jail. 25, 12H6.

A'. NEWTON &

DROP TABLE ME APPucATxmi man ofc. 21,

Pat

A. E. NEWTON & F. K. HENDRICKSON. DROP TABLE MECHANISM FOR MILLING MACHINES.

APPLICATION FILED DEC. 2i. I9I4.

Patented Jan. 25, 1916.

3 SHEETS-SHEET 3.

SWWSM.

Je STATES ALBERT E. NEWTOBJAND FRED K. HENDBICKSON, OF WORCESTER. MASSACHUSETTS, ASSIGNORS TG REED-PRENTICE COMPANY. A CQRPORATIGN DI MASSACHUSETTS.

DROPI-TABLE MECHANISM FOR MILLING-MACHINES.

einen. f

Application filed Becember 21, 19M.

l?) .//IZ frita/ni.- z'z may concur/i.: l

Vlle it known that we. Anni-arr ll. Xnwa'ox' Finiti li. l'liixonn'iisox. eitizem` of the ted States. lioth residing at lori-ester, in the county ot' lv'oreester and State oi'l l have invented a new and itlanisaehuwtts. nseiul Drop-'falde Meehanialn for Millingiiaehinee. ot whieh the following is a speciiiration. l

Thin invention relates to`a iuilling inaehine and the prineipal oliierts thereot' are to provide arrangement for positivel)Y dropping the tahle after the eutting operation is finished. in sueh foi-rn that it is Siinplilied and rendered lesb` expensive to inalie and keep in condition than has heen the ease with tahle drop devices with whieh we are familiar; to provide a simple and praetirahie rneanS t'or holding the talile rigidl)y while it in its raised position so as to prevent chattering: to provide. in eoinlzination with the table dropping means. a siniv ple and convenient arrangement liv which the tahle will lie caused to drop while on the high speed and will he reversed and iced haelt without elianging the speed. and to provide driving shaft dropping ineans for Stopping it on the high speed heifore it .cornes into cutting position so that when `Started again it will start on the high speed and then will he reduced during the Cutting operation only.

'They invention also involves improvements in details of eonstrnetion and eonihinat-inno of parts as will appear.

Yet'erenee is to he had to the aeeonipanving drawings in \vhieh-l `igure l is a front elevation ot' a milling inaehine ot the Lincoln type showing a preferred einhodinient of this invention applied thereto: Fig. 2 is an end elevation ot' the gaine: Fig. 3 is a view similar to Fig. 2 on enlarged Seale vshowing a part onliY of the ineelnlnisn'r: Fig.

4 is a plan of the work tahle and eonneeted parts: Fig. 5 is a seetional view of the line 3 of Fig. 3: Fig. f3 a Side elevation of the 'change lweed gearing: Fig. is a plan thereoiC showing the reverse gearing; Fig. is an end view showing a nioilifieation. Fig. 9 a rear elevation ot the anie; and Fig. 10 is an end riew of the cani thereof .showing the surfaee on whieh it rests in seetion. gf

The invention is Shown as applied to a Speccaton of Letters Patent.

Patented Jan. 25, H6.

serial N0. 878,2?9.

'inilling inaehine having a hed or traine l0 on whirh are supported a head Stork ll and tail rest l2. the latter not appearing in Figs. i and 3. Carried with the head storli are. hearings 13 for acone pullejv l1' to which power is transmitted t'roin a eountershatt. Ordinary ineehanisni l5 is Shown ,for raising and lowering the head renter.

Un the lied are located wa v lli on which tering and driving the eutter Spindle 25. A eutter 2C is lQhown on this spindle. The.

other end ot' this spindle is supported as ugual liv a tail eenter earried h v the tail rest 12. )lso shown on the' Shaft ot the eone. palle)V are n pair otI pulleys '12S for driving pulleysl 2t) on a Shat't 30.- This Shat' S() is mounted in a gear feed change nox 5l for driving thv ainr ordinary gearingl a Inhat't. 3; whieh iS eonneeted hy a. inno-ide joint with a tahle driving -l. whirlA is providtal` with a worin and a handle iti. Thin` shaft 3l accordingly is eapalile oil2 swinging on the linuelcle joint as a renter. The gear liox 3T in whieh it is loeated is provided witha slot 3S for limitv ing itsv downward inotion.

rPhe worin inef-'hes with a worin wheel 39 looz-'elv mounted on a Shaft 40 in this gear hoi: 37. Also mounted on the shaft Si is a hevel gear 4l' meshing with a bevel gear 4x2 on a shaft parallel with the shaft;

shaft` 40,. This Shaft 453 is provided with a spur gear -ti meshing with a spur gear 45 loose. on the Shaft 40. Bv means of a- Clutch 46 either the spur gear 45 or worin wheel 39 lan he ixed to the shaft 40 in an ordinary inanner no as to drive this Shaft either at the speed of the Shaft '+13 or at a mueh lower speed through the worin gear.

The shat't 40 is provided with a spur gear 4S on the rear end which meshes with an idleI gear 49 of the saine Size which in turn meshes with a gear 50 of the @ame size loose I resting on these arms.

the pl4 Ager 64 moves the arm 62 down and 'pivoted on a stud on a shaft 51. On this shaft 51 is loosely located another gear 52 meshing with agear 53 tight on the shaft 40. A clutch 54 secures either the gear 50 or to the shaft 51 and thus provides for driving'in either direction. The shaft 51 by means oi" gears drives a feed screw 56 meshing with a nut (not shown) on the work tablev 21 fory operating the same.

The clutches 46 and 54 can be operated hy'hand by a ,plying a wrench to the square ends of a shaliit 57 or sleeve 57. The clutch 46 is connectedwith a lever- 58 which is connccted'hy a link 59 with-an arm 60 adapted to turn on a stud 61. For the'purpose of turning this arm in. opposite directions from its normal position shown in Fig. '3 two arms 62 and 63 are also pivoted on the stud and provided with means for turning the arm when depressed. l

A pair of plungers 64 and 65 are provided The depression of the arm 6() to the right in Fig. 3 and moves the clutch to the left at Fig. 6`so as to connect the shaft 56 with the high speed..v The depression of the other plunger 65 operates through the arm 63 to give the opposite effect and vconnect this shaft with the slow speed through the worm gear 39. It is to be noted that the work table is provided as usual with swinging dogs 66 for operating the two plungers 64 and 65 and with similarly shaped but diii'erently arranged reversing dogs 67 for engaging and operating the reversing plungers 68. l The latter control the reverse .through a lever 69 and connections.

One of the main features of this invention relates to the drop of the table 19. This 'drop table is capable of a swinging motion at the end suiiicient to drop the work down after thev cut is made and allow it to feed back with the work out of contact withthe cutter. This is accomplished by a lever 72 73 on the carriage 17. This lever is provided with a stud 74 which is pivoted to a link 75 which in turn is ivoted to the end of the drop table 19. Ihis provides a toggle joint for operating the drop table positively-in both 'directions and raising 1t exactly to a predetermined elevation. '1

When the lever 72 is in vertical position as shown in Fig. 2 the table is raised to its highestposition but when the lever is moved out to the right itA causes the link 75 to swing outwardly and allows the table to drop slightly. For the purpose of operating this lever the work table 21 is provided with two arms78 and on these are mounted adjustable stops 79 and 8 0 for engaging the end of this lever 72 at opposi ends of' e travel of the table. In the position shown in Fig. 3 the stop 80 has just engaged the `screw 82 having raised to its highest position, thus securely' holding it' against chattering during the working' stroke. v

The table is provided with 86 adapted to engage the end nl" a lever 88 on the rear side of the machine. This lever is `connected by a link with a drop work lever 89 having a projection 90 on the bottom for engaging an arm 91 suj'iporting the table drivingI shaft. Howeverfirhen a pivoted dog the dog 86 operates this arm 87 to push it? out the lever 89 will be operated to release the shaft 34 and allowit to drop awa-f' *e its lowermost position where the geared-i will be out of mesh. i operated by hand through a. handle 93.

The

The lever 69 can oc l The operation of the machine -as 'tol lows Assuining that the driving shaft 34 is down in inoperative position, it will be understood that the'shaft 34 is being driven by power and that the cutter 26 is rotating. The work table is back away from the cutter but not in its extremeJw rear position. ln order to start the operation the only thing necessary is to grasp the handle 36 and raise the worm until it meshes with the worm wheel and the gears 44 and 45 also mesh. Then the projection is automatically moved into position by a spring 92 to hold up the shaft until released. The table thus starts forward at full speed being driven by the gears 44 and 45. Vhenthe table moves substantially into position for the work to engage the cutter one of the dogs 66 engages the top of the plunger 65 and l.forces los.'

it down. This moves the clutch 46 over to release the ear 45 and engage the worm wheel 39. his reduces the speed of the feed until the cutting operation is completed. At that time the other dogl 66 engages the plunger 64and moves the clutch back to its former position so as to cause the table to continue its motion in the same direetionat high speed. Shortly after this change the table moves into such position that the stop 79 engages the lever 72 and vslightly afterward one of the reversing iso 94 and the other dog 6T engages the reverse plunger 68. rlhus the table is i'aised to its working position and then reversed but still moves at the high speed. On starting back the dog S6 engages the end 8T of the lever S8 and drops the. worm shaft down'out of operative position, This stops the feed, leaving the parts in the position in which they were assumed to have started. lt will be seen therefore that the table is dropped and raised in a. positive and thoroughly mechanical manner and that when raised it is held there by an exceedingly simple device. Furthermore the toggle joint for raising and lowering the table is capable of being formed in a strong anddurable manner without excessive expense and will not require frequent repairs or adjustment. By connecting the shafts 40 and 51 by two trains of gears one containing an odd number and thel other an even number, it will be seen that the driven shaft can be rotated in either direction.

In the form shown in Figs. 8 and 9, the table is dropped with a different motion in such a way as to take less time and necessitate a shorter travel .of the sliding table and of the operating lever in order to cause the table to drop. ln this way the operating lever can be engaged by the actuating stop on the sliding table before the cutting operation is completed and dropped suddenly when the cutting operation is finished and immediately reversed if desired. In this case the lever 95 corresponding with the lever 72 is pivoted on the carriage and its end is adapted to be'operated by the stops T0 and S0 in the same way as above described. lhis lever, however, is provided with two members, a projection 96 and a spring-controlled pawl 0T, for operating studs 08 pro-- ber 09.V This cam member is mounted on a shaft 100 which has a similar cam member and set of duplicate parts on the other end.

:The cam member is provided with a numof projecting surfaces 101 equal in numto the number of studs 08, and these designed to rest on a raised surface 102 on the carriage which has an abrupt lrop at one end. and an incline at the other. The surfaces 101 are all concentric with the shaft 100 but they drop oli' slightly to form non-concentric cam surfaces 103, each of which is connected with the next concentric surface 101 by a preferably radial surface 101k. The operation is as followszlpon the swinging of the lever 05 to the right by means of the stop T9, the projection 96 engages one of the studs 98 and turns the shaft 100 far enough to turn the surface 104- past the abrupt end ofthe surface 102 so as to allow the shaft, and consequently the drop table which carries the shaft, to drop. Upon the other stroke when the stop ber ber are jecting from the faceV of a rotary cam mem- S0 engages and operates the lever 95 in the opposite direction the pawl is caused to engage another one' of the studslS and to positively turn the shaft 100 in theI same direction an equal distainse` rl`his results in lifting the next surface 103 upon the surface 102l until the concentric surface 10i rests thereon. ln this way the table is raised and held at a denite height. ln this form the screw 82 is shown as provided with a stiif spring 10o located iu a cylinder 10T. Its purpose is to hold the table the same. wayY as in the other forni shown but not with absolute rigidity.

Although we have illustrated and described, our invention as applied only to the Lincoln type of milling machine and have Ashown only a single modification of the iuvention, we are aware of the fact that many modifications can be made therein without departing from the scope' of the invention as expressed in the claims, and that it can be applied to other types of milling inachines. Therefore, we do not wish to be limited to this particular typo of'machine, or to all the details of construction herein shown and described` but TWhatwe do claim isMv 1. in a milling machine, the combination with a drop work table, of positive means for automatically raising it, holding it at a constant level thi-ou the working stroke, and then allowi to descend and means carried by the table for actuating said positive means.

2. in a milling machine, the combination with a work table support pivoted at one end, and a slidinoj work table supported thereon, of means ior raising the free end of said work table, and means operated by the sliding work table for causing said work table to drop when it moves to a predetermined point.

3. In a milling machine, the combination with a d rop work table mounted to move up and down, and a. sliding work-table supported thereon, of a toggle joint connected with said work table for raising it and means connected with i sliding table for operating said tog i. in a milling mac 2 ie, the combination with a drop work table pivoted near one end, of a toggle joint connected with the other end for raising it, and reciprocating means supported on said table for operating said toggle joint. f

rn a h maciiine, the combination with a pivoted work table support, of a link connected with the free end thereof, a lever pivoted'to a stationary part of the machine and also connected to said link, whereby when said lever is operated the end of the table supportwill be raised or lowered,

-means for operating the lever, and means connected with said table support for holding it firmly in position when elevated so as to prevent chattering.

6. In a milling machine, the combination with; a, pivoted work table support, of a lever connected with the' free end thereof, means whereb when said lever is turned the A end of theta le support will be raised' or lowered, and means connectedwith said table sup ort for holding it firmly in position when e evated so as to prevent chattering, said means comprising a screw connected with the table support and having a nut on the end and adapted to engage the bottom of a stationary part of the'machine when the table is elevated. v

,7. In a' milling machine, the combination with a work table, a cutter spindle and itin r y in position when elevated so as to` means for reciprocatin the table, of means whereby the table will e raised or lowered, and means connected with said table for lim-4 its upward motion and holding it prevent chattering.

8. :In a milling machine, the combinationl of a pivoted Work table support, a work table slidably mounted thereon,.a toggle lever connected with said support for raising and dropping it and two adjustable stops on Said sliding table for engaging and operat-` ing said toggle lever.

9. In a milling machine, the combination with a slidingtable, of means for driving the sliding table comprising two shafts, two

trains 'of gearsffor connecting said shafts,

all the gearsof each train being constantly in meshfrand means for connecting either train of gearswith the shafts, one train containing an even number and the other an odd number of gears.

10. In a milling machine, the combination with a drop table and a sliding table thereon, of means for 4driving the sliding table comprising a bodily movable shaft, a hooked lever for holding said shaft in operative position, dogs on the sliding table, and connections operated by said dogs-for pulling said lever back to release and drop the shaft.

l1. In a milling machine, the combination with a sliding table, off means for driving the sliding table comprising twoshafts, two trains of gears for connecting said shafts, and means lfor connecting either train of gears with the shafts, one train lcontaining an even ynumber and the other an odd numi ber of gears, a movably mounted driving shaft, a hooked lever for holding. the driving Ashaft in operative, position, .and meansfor pulling saidlever back to release and drop the driving shaft.

` V12. In a milling machine, the combination with a slidin table, of means for driving the sliding ta le comprising a shaft having a worm thereon, a' gear driven by said shaft,4

a second shaft, a worm gear meshing with said worm, a gear meshing with the first gear, both said gear and' worm gear being loose on the second shaft, and means operated by the table for connecting either the Y 'gear or Worm gear with the second shaft for 

